You don't HAVE to flash the phone to debrand it.

You can debrand using XS++ or FAR to remove/replace specific preloaded games/ringtones/startup screens..etc. You can upload customize_upgrade.xml to enable MP3 ringtones/tech-mode/flash theme(for W series)/data counter, to make preloaded games deleteable, to make pre-configured internet accounts/profiles modifiable or deleteable.

Most CID52 phones can be unlocked for free through a patch.